Query etcd keys

query-etcd.sh

#!/bin/bash -eux

# This file is based on https://code.launchpad.net/~freyes/+git/experiment
# Modified to use xargs instead of parallel

# 'etcd.etcdctl' is provided by the etcd snap
which etcd.etcdctl

PARALLEL_REQS=20
SLEEP_SECS=0.1
KEY="/registry/services/endpoints/kube-system/kube-controller-manager"
TEMPLOG=$(mktemp).log
[[ $(cat /var/snap/kube-apiserver/current/args) =~ --etcd-servers=(.[^ ]+) ]]
ETCD_ENDPOINTS=${BASH_REMATCH[1]}

echo "logging to $TEMPLOG"
echo "etcd endpoints: $ETCD_ENDPOINTS"


# trap ctrl-c and call ctrl_c()
trap ctrl_c INT

function ctrl_c() {
  local DEST=query-etcd.$(date '+%Y%m%d_%H%M').log
  mv $TEMPLOG $DEST
  echo "output at $DEST"
  exit 0
}

set +x
while true; do
  seq $PARALLEL_REQS | xargs -I {} -P$PARALLEL_REQS sudo etcd.etcdctl --cacert /root/cdk/etcd/client-ca.pem --cert /root/cdk/etcd/client-cert.pem --key /root/cdk/etcd/client-key.pem --endpoints=$ETCD_ENDPOINTS get -w json $KEY 2>&1 >> $TEMPLOG
  /bin/sleep $SLEEP_SECS
done